微處理器 - Allwinner V3S (Lichee Pi Zero) - Assembly - LED

LED接到PG0~PG2


GPIO位址


PG_CFG0


PG_DATA


main.s

    .global _start

    .equ GPIO_BASE, 0x01c20800
    .equ PG_CFG0,   (GPIO_BASE + (0x24 * 6) + 0x00)
    .equ PG_DATA,   (GPIO_BASE + (0x24 * 6) + 0x10)

    .arm
    .text
_start:
    .long 0xea000016
    .byte 'e', 'G', 'O', 'N', '.', 'B', 'T', '0'
    .long 0, __spl_size
    .byte 'S', 'P', 'L', 2
    .long 0, 0
    .long 0, 0, 0, 0, 0, 0, 0, 0
    .long 0, 0, 0, 0, 0, 0, 0, 0
    
_vector:
    b reset
    b .
    b .
    b .
    b .
    b .
    b .
    b .
    
reset:
    ldr r0, =PG_CFG0
    ldr r1, =0x00000001
    str r1, [r0]

    ldr r0, =PG_DATA
    ldr r1, =(1 << 0)
0:
    eor r2, r1
    str r2, [r0]
    ldr r3, =5000000
1:
    subs r3, #1
    bne 1b
    b 0b
    .end

main.ld

MEMORY {
    RAM : ORIGIN = 0, LENGTH = 32K
}

SECTIONS {
    text : {
        PROVIDE(__spl_start = .);
        *(.text*)
        PROVIDE(__spl_end = .);
    } > RAM
    PROVIDE(__spl_size = __spl_end - __spl_start);
}

Makefile

all:
	arm-linux-gnueabihf-as -mcpu=cortex-a7 -o main.o main.s
	arm-linux-gnueabihf-ld -T main.ld -o main.elf main.o
	arm-linux-gnueabihf-objcopy -O binary main.elf main.bin
	gcc mksunxi.c -o mksunxi
	./mksunxi main.bin

run:
	sunxi-fel -p write 0 main.bin && sunxi-fel exec 0

clean:
	rm -rf main.bin main.o main.elf

編譯

$ make
    arm-linux-gnueabihf-as -mcpu=cortex-a7 -o main.o main.s
    arm-linux-gnueabihf-ld -T main.ld -o main.elf main.o
    arm-linux-gnueabihf-objcopy -O binary main.elf main.bin
    gcc mksunxi.c -o mksunxi
    ./mksunxi main.bin
    The bootloader head has been fixed, spl size is 512 bytes.

下載

$ make run
    sunxi-fel -p write 0 main.bin && sunxi-fel exec 0
    100% [================================================]     1 kB,  139.3 kB/s

完成